<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <title>CSS3 圆形动画</title>
  <link rel="stylesheet" href="css/style.css">
</head>

<body>
  <div class="dots"></div>
  <div class="dots2"></div>
  <div class="dots3"></div>
  <div class="dots4"></div>
</body>

</html>